Magnetic reproducer



Nov. 4, 1930.

F. E. FISCHLER MAGNETI C REPRODUGER Filed June 9. 1927 4 IN VEN TOR.

A TTORNE Y.

Patented Nov. 4, 1930 PATENT OFFICE PAUL E. FISCHLER, F BAY CITY,MICHIGAN MAGNETIC REPRODUCER Application filed. June 9, 1927.

This invention relates to a magnetic sound reproducer, and it consistsin the novel features hereinafter described and claimed.

An object of the invention is to provide a device of the characterstated, adapted to be used in conjunctionwith phonographs or the likeand which will transmit a more sensitive wave vibration than thoseheretofore used. WVhile the device may be used in conjunction withphonographs, it may also be used in conjunction with piano and organmusic for broadcasting purposes.

A further object of the invention is to provide, in conjunction with asuitable vibrating member, means which may be used as a cone speaker forradio broadcast reproduction.

With these and other objects in view, the

structure of the instrument includes a plate 29 upon which a permanentmagnet is mounted. The magnetic cores are carried at the poles of themagnet and an armature consisting of a steel reed is disposed betweenthe cores and is held by a needle holder, which in turn is adjustablysupported upon the said plate. A needle of usual pattern is carried bythe needle holder.

In the accompanying drawing:

Figure 1 is a front elevation of the instru ment, showing one form ofthe arrangement of the parts thereof.

Figure 2 is a sectional view thereof, cut on the line 22 of Figure 1.

Figure 3 is a front elevation of a modified form of the instrument. v

Figure 4c is a sectional view thereof, cut on the line 4.4 of Figure 3.

As illustratedin the accompanying drawing, the magnetic sound reproducerconsists of a base plate 1, upon which is mounted a permanent magnet 2.In the form of the arrangement as shown in Figures 1 and 2, core members3 areadjustably connected with the poles of the magnet 2, the coils atare mounted upon the said cores. Adjusting screws 5 are supported uponthe plate 1 and a needle holder 6 is carried between the inner ends ofthe said screws. ried by the needle holder 6 and the intermediateportion thereof is disposed between the A steel reed 7 is car- SerialNo. 197,537.

cores 3. A needle 9 is carried by the needle holder 6 in the usualmanner. The opposite end of the reed 7 is disposed between spacedcontact plates 8 which are adj ustably mounted on the base 1 by means ofthe bolts 8, these bolts being anchored in the base and threaded toreceive spaced nuts 8 between which the plates 8 are mounted. Rubbercushions 10-are interposed between the plates and the armature, and itwill be obvious that the armature may be adjusted to center withrelation to the magnet by means of the nuts 8", and to compensate fornatural dissipation or deterioration of the energy in the magnet.

A vertical adjustment of the armature in relation to the cores isprovided by said plates. The resilient rubber damping pads 10 arecarried by the plates 8 and firmly clamp the end of the armature,limiting its movement I to a certain frequency range, thereby dampingout resonance in the armature assembly and controlling the tone qualityof reproduction.

In the form of the arrangement of the features of the instrument, asshown in Figures 3 and 4, the same consists in fixing the core members 3to the poles of the magnet 2. The coils 4 are mounted upon the cores 3in the same manner as shown in Figures 1 and 2. The needle holder 6 issupported bythe screws 5 mounted upon the plate 1 and it carries theneedle 9 as hereinbefore described. The free end of the reed 7 isprovided along its opposite edges with outstanding shoulders 7 which aredisposed towards the coils 4 and which normally lie above the inner endsof the cores 3.

The device incorporates the novel features of construction, and theprinciples above mentioned, and further affords an efiicient means fortransferring to a pulsating or fluctuating A. C. current, the vibrationsfrom a phonograph record. The fluctuating A. C. current may be amplifiedto great volume by any one of the known eflicient means, resulting in reproduction of phonograph music in a great degree of faithfulness andfreedom from mechanical noises. The device further affords aninexpensive means of securing the foregoing results with a freeness fromdelicate adjustment, and with very little possibility of becominginoperative from mechanical faults.

From the foregoing description of the construction of my improvedappparatus, it will be seen that I have provided a simple, inexpensiveand eflicient means for carrying out the objects of my invention, andwhile I have particularly described the elements best adapted to performthe functions set forth, it is obvious that various changes in form,proportion and in the minor details of construction may be resorted towithout depart ing from the spirit or sacrificing any of the principlesof the invention.

Having described the invention, What is claimed is:

1. An electric pick-up device comprising a plate, a permanent magnetmounted thereon, cores mounted upon the poles of the magnet, coilsmounted upon the cores, a reed armature disposed between the coils andtransversely of the cores, means for fixedly supporting the reed, saidmeans being adapted to hold a needle.

2. An electric pick-up device comprising a plate, a permanent magnetmounted thereon, cores adjustably connected with the poles of themagnet, coils mounted upon the cores, a needle holder mounted upon theplate, a reed armature fixedly carried by the needle holder, said reedbeing disposed between the coils and transversely of the cores, saidneedle holder adapted to support a needle.

3. An electric pickup device comprising a base, a permanent magnetmounted thereon, means carried by the base plate for adjustablysupporting a needle holder, a needle holder carried by said means, aresilient armature the outer end of which is carried by the needleholder and disposed between the coils and transversely of the cores andmeans for adjusting the inner end of the armature.

4. An electric pick-up device comprising a plate, a magnet mountedthereon, coils carried at the poles of the magnet, a needle holdermounted upon the plate, a'resilient armature arranged in the magneticfield attached at its outer end to the needle holder, and means foradjustably confiningthe opposite end of the armature, the intermediateportion of the armature being disposed between the coils.

5. An electric pick-up device comprising a plate, a permanent magnetthereon, cores of magnetic material on the poles of the magnet andextending toward each other, coils on said cores, an armature arrangedin the mag netic field and extending across the opposing ends of saidcores and means for fixedly holding and also for adjusting the ends ofthe armature, the outer end thereof in the direc tion of the axes ofsaid pole extension cores and the inner end thereof in a directionsubstantially at right angles to said axes.

